Effect of Nano-MgO Additive on Compressive Strength of Concrete Fabricated by Different Processing Methods

Journal of Advanced Materials and Processing

دوره 10، شماره 1 - شماره پیاپی 37، فروردین 2022، صفحه 57-65   

نوع مقاله: Research Paper

نویسندگان

Eisa Mahmoudsaleh¹؛ Ali Heidari^{* 2}؛ Farshid Fathi³؛ Seyed Ali HassanzadehTabrizi⁴

¹Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

²1Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran 2Department of Civil Engineering, University of Shahrekord, Shahrekord, Iran

³Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.

⁴Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.

چکیده

The effects of adding different nano-MgO dosages (0, 1, 2, 3, and 4 wt.% with respect to cement) on microstructural, compressive strength, and phase evaluation of concrete were investigated. Two different post-treatment conditions with water and CO₂ gas were used to study the processing method on the samples. The specimens were characterized via SEM and XRD analysis. The mechanical properties of the samples were also investigated. The results showed that compressive strength significantly improved after the addition of magnesium oxide nanoparticles. However, this improvement was more remarkable in the case of post-treatment with CO₂ compared to the samples fabricated with water. SEM results showed that the samples treated under CO₂ gas had irregular and needle-like morphology. The samples prepared by normal processing had CaCO₃ and SiO₂ phases, whereas the ones fabricated under CO₂ gas contained CaCO₃, SiO_2, and Ca(OH)₂. With the addition of nano-MgO, the density of concrete decreases in the samples post-treated with water, whereas it increases for the samples post-treatment with CO₂ gas. Adding 4 wt.% nano-MgO to concrete and further post-treatment with CO₂ for 45 days could increase the mechanical properties from ~ 23 MPa to ~ 55 MPa.

کلیدواژه‌ها

Nanomaterials؛ MgO؛ Concrete؛ Mechanical properties

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